/*
 * @Author: funlee
 * @Email: i@funlee.cn
 * @Date: 2018-01-12 01:19:48
 * @Last Modified time: 2018-01-12 01:19:48
 * @Description: 气泡 
 */
window.onload = function () {
  var canvas = document.querySelector('.canvas')
  var cxt = canvas.getContext('2d')

  cxt.moveTo(75, 25);
  cxt.quadraticCurveTo(25, 25, 25, 62);
  cxt.quadraticCurveTo(25, 100, 50, 100);
  cxt.quadraticCurveTo(50, 120, 30, 125);
  cxt.quadraticCurveTo(60, 120, 65, 100);
  cxt.quadraticCurveTo(125, 100, 125, 62);
  cxt.quadraticCurveTo(125, 25, 75, 25);
  cxt.stroke();

}
